CC Ādi 17.269
bhikṣā karāiyā tāṅre kaila nivedana
The Lord offered him respectful obeisances and invited him to His house. After feeding him sumptuously, He submitted to him His petition.
According to the system of Vedic society, whenever an unknown sannyāsī comes to a village or town, someone must invite him to take prasādam in his home. Sannyāsīs generally take prasādam in the house of a brāhmaṇa because the brāhmaṇa worships the Lord Nārāyaṇa śilā, or śālagrāma-śilā, and therefore there is prasādam that the sannyāsī may take. Keśava Bhāratī accepted the invitation of Śrī Caitanya Mahāprabhu. Thus the Lord had a good opportunity to explain His desire to take sannyāsa from him.